Clean warnings in context when transforming multiple files #665
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Summary
Using libCST cli tool allows to run a codemod over files inside a folder recursively. Context warning messages were not being cleaned between files, so warnings from one files could be passed to other files in the context. Because of that warnings were being shown wrongly in the summary and the total number of warnings was wrong as well.
Test Plan
python3 -m unittest libcst.codemod.tests.test_codemod_cli